[Az-Geocaching] Should I archive this cache?

I've noticed that one of my caches, "Gecko's Sea Creature (GCJ7H6)," was
placed a mere 23 feet from an already existing first state of a multicache
(GC5173). I recall hearing that it's common to keep your caches at least
528 feet from another. I'm thinking I should archive this cache, however
nobody's really said anything. Any thoughts?

Thanks.


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